Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82837f7833fb8a0…

MALICIOUS

PDF

75.5 KB Created: 2021-01-02 12:55:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7cbe1f6e9002c01248a88e9177e05093 SHA-1: 149862fd7840664fe54e89f253b4be6777b03441 SHA-256: d82837f7833fb8a05a615504769bd7d017d62d8ff19d374f693567f820cafc54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/aws?utm_term=chicken+invaders+1 PDF link annotation
    • https://cdn.sqhk.co/vumivatuvi/7Jgd67a/nhl_playoffs_2019_vegas_golden_knights.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/jagggd7/tonoraxiveguj.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/jawijuvuverow.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/dypJifI/lekelinobuzox.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/geiigio/lasifiv.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/jcMjcih/salujevabibawuromademoza.pdfIn PDF document text
    • https://xadutodibuj.weebly.com/uploads/1/3/1/1/131164520/mabutuk.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/493898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413982/normal_5fce694d0bc28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_5fb7a29554b87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0d54cce9-f598-46fe-8b6e-3173bca8ac0a/74119284756.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/early_waiver_wire_pickups_week_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c56be6e9-48d6-4d40-9253-a4752fc280de/vitamix_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/android_translation_malayalam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 4792 bytes
SHA-256: 14d630bf8519242fd5a7c10bbc9c1c11978db14ad0937f1e48a9a7bd0959b5f9
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 10448 bytes
SHA-256: 6eb50c963a1af108a8e8f6600e7c2047a7bb51ea0aa2185ba62a7a42eb4907fb
font_02_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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